Funding for this research was provided by:
The Norwegian Directorate of Health
Article History
First Online: 21 April 2017
Compliance with Ethical Standards
:
: The Incredible Years is a trademark owned by The Incredible Years, Inc. The authors declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.